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I cut the 6×10 out of paper and have been unable to make any other rectangles. Reading the Wikipedia page where you got that graphic it turns out there are only 2 solutions to the 3×20 (both of which use the same pieces). At least one piece in the 6×10 (e.g. L piece) is the mirror of the one in the 3×20 which means that it is impossible to use the pieces in the 6×10 to make a 3×20.
So I am pretty sure the only way to do it is to start with the 3×20 pieces, which you have done. Was that coincidence or deliberate?
frankenbike
@moocher
to put it another way, i want to make one of the solutions, colour in the top faces and then make the other solutions without having to turn any of the pieces over - in this case i made the 3x20, drew some lines, then when I come to make the 4x15 the 'P' needs to be turned over.
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